spare tire

Hello, I have a 2012 Liberty Jet with a spare donut-type tire that fits under the back end. I need to replace the spare tire I have but a new one is proving to be hard to find. I've looked at a few auto wreckers so far, but first, I want to know if its possible to fit a regular full sized tire...

Got rear-ended 2 weeks ago by some dumb 18-year old who was probably on her cellphone. Thankfully the '07 KJ is driveable with only cosmetic repair. I've been to the local junkyards and seen 2 options for tailgates (Mopar tailgate costs 1k+ Shipping) but I have not learned how to replace the...